Add more clarity

[CeciAc]

@vasiliuk commented on Thu Mar 21 2019

It is not clear if this method take into account sizeof(T).
Actually this method increment your reference by elementOffset * sizeof(T);

---

Сведения о документе

⚠ Не вносите правки в этот раздел. Это необходимо для связывания страницы сайта docs.microsoft.com с вопросом на GitHub.

• ID: c1853c4d-9453-f5eb-081b-b48a6662bfd5
• Version Independent ID: e5454f16-981c-e7d6-a708-311306413e41
• Content: Unsafe.Add Method (System.Runtime.CompilerServices)
• Content Source: xml/System.Runtime.CompilerServices/Unsafe.xml
• Product: dotnet-api
• GitHub Login: @dotnet-bot
• Microsoft Alias: dotnetcontent

[CeciAc]

Hi team,
I'm moving this here since the contributor is making a suggestion on the original documentation
best